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|
package stream
import (
"fmt"
"io"
"gitlab.com/gitlab-org/gitaly/v16/proto/go/gitalypb"
)
// StdoutStderrResponse is an interface for RPC responses that need to stream stderr and stdout
type StdoutStderrResponse interface {
GetExitStatus() *gitalypb.ExitStatus
GetStderr() []byte
GetStdout() []byte
}
// Sender is a function that sends input data to the stream
type Sender func(chan error)
// Handler takes care of sending and receiving to and from the stream
func Handler(recv func() (StdoutStderrResponse, error), send func(chan error), stdout, stderr io.Writer) (int32, error) {
var (
exitStatus int32
err error
resp StdoutStderrResponse
)
errC := make(chan error, 1)
go send(errC)
for {
resp, err = recv()
if err != nil {
break
}
if resp.GetExitStatus() != nil {
exitStatus = resp.GetExitStatus().GetValue()
}
if len(resp.GetStderr()) > 0 {
if _, err = stderr.Write(resp.GetStderr()); err != nil {
break
}
}
if len(resp.GetStdout()) > 0 {
if _, err = stdout.Write(resp.GetStdout()); err != nil {
break
}
}
}
if err == io.EOF {
err = nil
}
if err != nil {
return exitStatus, err
}
select {
case errSend := <-errC:
if errSend != nil {
// This should not happen
errSend = fmt.Errorf("stdin send error: %w", errSend)
}
return exitStatus, errSend
default:
return exitStatus, nil
}
}
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